Improvement of cheek retractor for clinical dental photograph of dental profession

Abstract

Objective To measure Chinese occlusion cast and skull lateral projection to acquired height, depth and arch of normotopia and lateral position, so as to obtain the data of national people for improvement of dental retracter and enhancing photography quality. Methods From May 2008 to May 2010 in Department of Orthodontics Peking University School and Hospital of Stomatology, a total of 247 cases were selected by convenient sampling method. The patients selected completed nonextraction treatment and had all permanent teeth without loss of tooth and second accessional teeth dentia already, and their molar relationship was neutral, and their overbite and overlap were normal. After treatment, we ensured fang′s point, molar point, subspinable, supramentale, maxillary second molar distal to the surface profile and mandibular second molar distal to the neck point by deposit model and skull lateral projection. The dental retracter height and depth of normotopia and lateral position, and we compared the measurement values of dental retracter between existed retracter and retracter model by X-ray. Results The model and X-ray measured depth of normotopia and lateral position, which were (39.54±4.29) mm and (36.18±3.26) mm compared with a similar size 39.20 mm and 34.41mm of existed retracter (P>0.05). The model and X-ray measured the height of model′s normotopi, which was (12.41±2.67) mm and was smaller than 16.13 mm of existed one (P<0.01); the model and X-ray measured the height of lateral position, which was (39.54±4.29) mm and bigger than the existed one (31.16 mm) (P<0.01). Conclusions The national dental retracter depth of normotopia and height of lateral position are discrepant with existed dental retracter, so it requires to design material retracter for clinical use, and compare with traditional retracter′s surface of image to find out the shortages and improve. Key words: Orthodontics; Retractor; Medical photography